diff --git a/src/mesh_generator_thread.cpp b/src/mesh_generator_thread.cpp
index d95506de1..f06bddb57 100644
--- a/src/mesh_generator_thread.cpp
+++ b/src/mesh_generator_thread.cpp
@@ -28,14 +28,6 @@ with this program; if not, write to the Free Software Foundation, Inc.,
 	CachedMapBlockData
 */
 
-CachedMapBlockData::CachedMapBlockData():
-	p(-1337,-1337,-1337),
-	data(NULL),
-	refcount_from_queue(0),
-	last_used_timestamp(time(0))
-{
-}
-
 CachedMapBlockData::~CachedMapBlockData()
 {
 	assert(refcount_from_queue == 0);
@@ -47,16 +39,6 @@ CachedMapBlockData::~CachedMapBlockData()
 	QueuedMeshUpdate
 */
 
-QueuedMeshUpdate::QueuedMeshUpdate():
-	p(-1337,-1337,-1337),
-	ack_block_to_server(false),
-	urgent(false),
-	crack_level(-1),
-	crack_pos(0,0,0),
-	data(NULL)
-{
-}
-
 QueuedMeshUpdate::~QueuedMeshUpdate()
 {
 	delete data;
diff --git a/src/mesh_generator_thread.h b/src/mesh_generator_thread.h
index 3ac086e30..77b34a3ce 100644
--- a/src/mesh_generator_thread.h
+++ b/src/mesh_generator_thread.h
@@ -27,25 +27,25 @@ with this program; if not, write to the Free Software Foundation, Inc.,
 
 struct CachedMapBlockData
 {
-	v3s16 p;
-	MapNode *data; // A copy of the MapBlock's data member
-	int refcount_from_queue;
-	int last_used_timestamp;
+	v3s16 p = v3s16(-1337, -1337, -1337);
+	MapNode *data = nullptr; // A copy of the MapBlock's data member
+	int refcount_from_queue = 0;
+	int last_used_timestamp = std::time(0);
 
-	CachedMapBlockData();
+	CachedMapBlockData() {}
 	~CachedMapBlockData();
 };
 
 struct QueuedMeshUpdate
 {
-	v3s16 p;
-	bool ack_block_to_server;
-	bool urgent;
-	int crack_level;
+	v3s16 p = v3s16(-1337, -1337, -1337);
+	bool ack_block_to_server = false;
+	bool urgent = false;
+	int crack_level = -1;
 	v3s16 crack_pos;
-	MeshMakeData *data; // This is generated in MeshUpdateQueue::pop()
+	MeshMakeData *data = nullptr; // This is generated in MeshUpdateQueue::pop()
 
-	QueuedMeshUpdate();
+	QueuedMeshUpdate(){};
 	~QueuedMeshUpdate();
 };
 
@@ -101,14 +101,11 @@ private:
 
 struct MeshUpdateResult
 {
-	v3s16 p;
-	MapBlockMesh *mesh;
-	bool ack_block_to_server;
+	v3s16 p = v3s16(-1338, -1338, -1338);
+	MapBlockMesh *mesh = nullptr;
+	bool ack_block_to_server = false;
 
-	MeshUpdateResult()
-	    : p(-1338, -1338, -1338), mesh(NULL), ack_block_to_server(false)
-	{
-	}
+	MeshUpdateResult() {}
 };
 
 class MeshUpdateThread : public UpdateThread
diff --git a/src/mg_biome.h b/src/mg_biome.h
index 2e07fd9cf..854ada504 100644
--- a/src/mg_biome.h
+++ b/src/mg_biome.h
@@ -117,10 +117,10 @@ public:
 	virtual Biome *getBiomeAtIndex(size_t index, s16 y) const = 0;
 
 	// Result of calcBiomes bulk computation.
-	biome_t *biomemap;
+	biome_t *biomemap = nullptr;
 
 protected:
-	BiomeManager *m_bmgr;
+	BiomeManager *m_bmgr = nullptr;
 	v3s16 m_pmin;
 	v3s16 m_csize;
 };
diff --git a/src/mg_decoration.cpp b/src/mg_decoration.cpp
index 1a469cd9c..b13ddbadb 100644
--- a/src/mg_decoration.cpp
+++ b/src/mg_decoration.cpp
@@ -67,21 +67,6 @@ size_t DecorationManager::placeAllDecos(Mapgen *mg, u32 blockseed,
 
 ///////////////////////////////////////////////////////////////////////////////
 
-
-Decoration::Decoration()
-{
-	mapseed    = 0;
-	fill_ratio = 0;
-	sidelen    = 1;
-	flags      = 0;
-}
-
-
-Decoration::~Decoration()
-{
-}
-
-
 void Decoration::resolveNodeNames()
 {
 	getIdsFromNrBacklog(&c_place_on);
@@ -330,13 +315,6 @@ int DecoSimple::getHeight()
 
 ///////////////////////////////////////////////////////////////////////////////
 
-
-DecoSchematic::DecoSchematic()
-{
-	schematic = NULL;
-}
-
-
 size_t DecoSchematic::generate(MMVManip *vm, PcgRandom *pr, v3s16 p)
 {
 	// Schematic could have been unloaded but not the decoration
diff --git a/src/mg_decoration.h b/src/mg_decoration.h
index 6a48796d8..968c78612 100644
--- a/src/mg_decoration.h
+++ b/src/mg_decoration.h
@@ -64,8 +64,8 @@ struct CutoffData {
 
 class Decoration : public ObjDef, public NodeResolver {
 public:
-	Decoration();
-	virtual ~Decoration();
+	Decoration() {};
+	virtual ~Decoration() {};
 
 	virtual void resolveNodeNames();
 
@@ -76,13 +76,13 @@ public:
 	virtual size_t generate(MMVManip *vm, PcgRandom *pr, v3s16 p) = 0;
 	virtual int getHeight() = 0;
 
-	u32 flags;
-	int mapseed;
+	u32 flags = 0;
+	int mapseed = 0;
 	std::vector<content_t> c_place_on;
-	s16 sidelen;
+	s16 sidelen = 1;
 	s16 y_min;
 	s16 y_max;
-	float fill_ratio;
+	float fill_ratio = 0.0f;
 	NoiseParams np;
 	std::vector<content_t> c_spawnby;
 	s16 nspawnby;
@@ -104,13 +104,13 @@ public:
 
 class DecoSchematic : public Decoration {
 public:
-	DecoSchematic();
+	DecoSchematic() {};
 
 	virtual size_t generate(MMVManip *vm, PcgRandom *pr, v3s16 p);
 	virtual int getHeight();
 
 	Rotation rotation;
-	Schematic *schematic;
+	Schematic *schematic = nullptr;
 };
 
 
diff --git a/src/mg_ore.cpp b/src/mg_ore.cpp
index 6275de313..f959ca9e6 100644
--- a/src/mg_ore.cpp
+++ b/src/mg_ore.cpp
@@ -72,14 +72,6 @@ void OreManager::clear()
 
 ///////////////////////////////////////////////////////////////////////////////
 
-
-Ore::Ore()
-{
-	flags = 0;
-	noise = NULL;
-}
-
-
 Ore::~Ore()
 {
 	delete noise;
@@ -232,8 +224,6 @@ void OreSheet::generate(MMVManip *vm, int mapseed, u32 blockseed,
 OrePuff::OrePuff() :
 	Ore()
 {
-	noise_puff_top    = NULL;
-	noise_puff_bottom = NULL;
 }
 
 
@@ -385,7 +375,6 @@ void OreBlob::generate(MMVManip *vm, int mapseed, u32 blockseed,
 OreVein::OreVein() :
 	Ore()
 {
-	noise2 = NULL;
 }
 
 
diff --git a/src/mg_ore.h b/src/mg_ore.h
index 77025e1bb..4b052e07a 100644
--- a/src/mg_ore.h
+++ b/src/mg_ore.h
@@ -62,13 +62,13 @@ public:
 	s16 y_min;
 	s16 y_max;
 	u8 ore_param2;		// to set node-specific attributes
-	u32 flags;          // attributes for this ore
+	u32 flags = 0;          // attributes for this ore
 	float nthresh;      // threshold for noise at which an ore is placed
 	NoiseParams np;     // noise for distribution of clusters (NULL for uniform scattering)
-	Noise *noise;
+	Noise *noise = nullptr;
 	std::unordered_set<u8> biomes;
 
-	Ore();
+	Ore() {};
 	virtual ~Ore();
 
 	virtual void resolveNodeNames();
@@ -104,8 +104,8 @@ public:
 
 	NoiseParams np_puff_top;
 	NoiseParams np_puff_bottom;
-	Noise *noise_puff_top;
-	Noise *noise_puff_bottom;
+	Noise *noise_puff_top = nullptr;
+	Noise *noise_puff_bottom = nullptr;
 
 	OrePuff();
 	virtual ~OrePuff();
@@ -127,7 +127,7 @@ public:
 	static const bool NEEDS_NOISE = true;
 
 	float random_factor;
-	Noise *noise2;
+	Noise *noise2 = nullptr;
 
 	OreVein();
 	virtual ~OreVein();
@@ -160,7 +160,7 @@ public:
 		case ORE_VEIN:
 			return new OreVein;
 		default:
-			return NULL;
+			return nullptr;
 		}
 	}
 
diff --git a/src/mg_schematic.cpp b/src/mg_schematic.cpp
index 3cea3c321..c50e90b3a 100644
--- a/src/mg_schematic.cpp
+++ b/src/mg_schematic.cpp
@@ -37,9 +37,9 @@ with this program; if not, write to the Free Software Foundation, Inc.,
 
 
 SchematicManager::SchematicManager(Server *server) :
-	ObjDefManager(server, OBJDEF_SCHEMATIC)
+	ObjDefManager(server, OBJDEF_SCHEMATIC),
+	m_server(server)
 {
-	m_server = server;
 }
 
 
@@ -69,10 +69,6 @@ void SchematicManager::clear()
 
 Schematic::Schematic()
 {
-	schemdata   = NULL;
-	slice_probs = NULL;
-	flags       = 0;
-	size        = v3s16(0, 0, 0);
 }
 
 
diff --git a/src/mg_schematic.h b/src/mg_schematic.h
index db040343c..16e967a7c 100644
--- a/src/mg_schematic.h
+++ b/src/mg_schematic.h
@@ -117,10 +117,10 @@ public:
 		std::vector<std::pair<s16, u8> > *splist);
 
 	std::vector<content_t> c_nodes;
-	u32 flags;
+	u32 flags = 0;
 	v3s16 size;
-	MapNode *schemdata;
-	u8 *slice_probs;
+	MapNode *schemdata = nullptr;
+	u8 *slice_probs = nullptr;
 };
 
 class SchematicManager : public ObjDefManager {
diff --git a/src/minimap.cpp b/src/minimap.cpp
index 500f49828..9b17cbc6e 100644
--- a/src/minimap.cpp
+++ b/src/minimap.cpp
@@ -204,8 +204,6 @@ Minimap::Minimap(IrrlichtDevice *device, Client *client)
 	data->mode              = MINIMAP_MODE_OFF;
 	data->is_radar          = false;
 	data->map_invalidated   = true;
-	data->heightmap_image   = NULL;
-	data->minimap_image     = NULL;
 	data->texture           = NULL;
 	data->heightmap_texture = NULL;
 	data->minimap_shape_round = g_settings->getBool("minimap_shape_round");
@@ -275,14 +273,14 @@ void Minimap::toggleMinimapShape()
 void Minimap::setMinimapShape(MinimapShape shape)
 {
 	MutexAutoLock lock(m_mutex);
-	
+
 	if (shape == MINIMAP_SHAPE_SQUARE)
 		data->minimap_shape_round = false;
 	else if (shape == MINIMAP_SHAPE_ROUND)
 		data->minimap_shape_round = true;
-	
+
 	g_settings->setBool("minimap_shape_round", data->minimap_shape_round);
-	m_minimap_update_thread->deferUpdate();	
+	m_minimap_update_thread->deferUpdate();
 }
 
 MinimapShape Minimap::getMinimapShape()
diff --git a/src/minimap.h b/src/minimap.h
index 58d05d668..04ac27a04 100644
--- a/src/minimap.h
+++ b/src/minimap.h
@@ -78,21 +78,19 @@ struct MinimapData {
 	MinimapPixel minimap_scan[MINIMAP_MAX_SX * MINIMAP_MAX_SY];
 	bool map_invalidated;
 	bool minimap_shape_round;
-	video::IImage *minimap_image;
-	video::IImage *heightmap_image;
-	video::IImage *minimap_mask_round;
-	video::IImage *minimap_mask_square;
-	video::ITexture *texture;
-	video::ITexture *heightmap_texture;
-	video::ITexture *minimap_overlay_round;
-	video::ITexture *minimap_overlay_square;
-	video::ITexture *player_marker;
-	video::ITexture *object_marker_red;
+	video::IImage *minimap_mask_round = nullptr;
+	video::IImage *minimap_mask_square = nullptr;
+	video::ITexture *texture = nullptr;
+	video::ITexture *heightmap_texture = nullptr;
+	video::ITexture *minimap_overlay_round = nullptr;
+	video::ITexture *minimap_overlay_square = nullptr;
+	video::ITexture *player_marker = nullptr;
+	video::ITexture *object_marker_red = nullptr;
 };
 
 struct QueuedMinimapUpdate {
 	v3s16 pos;
-	MinimapMapblock *data;
+	MinimapMapblock *data = nullptr;
 };
 
 class MinimapUpdateThread : public UpdateThread {
@@ -105,7 +103,7 @@ public:
 	bool pushBlockUpdate(v3s16 pos, MinimapMapblock *data);
 	bool popBlockUpdate(QueuedMinimapUpdate *update);
 
-	MinimapData *data;
+	MinimapData *data = nullptr;
 
 protected:
 	virtual void doUpdate();
diff --git a/src/modalMenu.h b/src/modalMenu.h
index 38a26535e..7dbf36fbc 100644
--- a/src/modalMenu.h
+++ b/src/modalMenu.h
@@ -48,11 +48,7 @@ public:
 		IGUIElement(gui::EGUIET_ELEMENT, env, parent, id,
 				core::rect<s32>(0,0,100,100))
 	{
-		//m_force_regenerate_gui = false;
-
 		m_menumgr = menumgr;
-		m_allow_focus_removal = false;
-		m_screensize_old = v2u32(0,0);
 
 		setVisible(true);
 		Environment->setFocus(this);
@@ -142,7 +138,7 @@ private:
 	IMenuManager *m_menumgr;
 	// This might be necessary to expose to the implementation if it
 	// wants to launch other menus
-	bool m_allow_focus_removal;
+	bool m_allow_focus_removal = false;
 };
 
 
diff --git a/src/mods.cpp b/src/mods.cpp
index 5a71ca2d4..a555a5b13 100644
--- a/src/mods.cpp
+++ b/src/mods.cpp
@@ -385,10 +385,8 @@ Json::Value getModstoreUrl(const std::string &url)
 #endif
 
 ModMetadata::ModMetadata(const std::string &mod_name):
-	m_mod_name(mod_name),
-	m_modified(false)
+	m_mod_name(mod_name)
 {
-	m_stringvars.clear();
 }
 
 void ModMetadata::clear()
diff --git a/src/mods.h b/src/mods.h
index 792280b8b..1a5c32692 100644
--- a/src/mods.h
+++ b/src/mods.h
@@ -42,19 +42,13 @@ struct ModSpec
 	std::unordered_set<std::string> optdepends;
 	std::unordered_set<std::string> unsatisfied_depends;
 
-	bool part_of_modpack;
-	bool is_modpack;
+	bool part_of_modpack = false;
+	bool is_modpack = false;
 	// if modpack:
 	std::map<std::string,ModSpec> modpack_content;
 	ModSpec(const std::string &name_="", const std::string &path_=""):
 		name(name_),
-		path(path_),
-		depends(),
-		optdepends(),
-		unsatisfied_depends(),
-		part_of_modpack(false),
-		is_modpack(false),
-		modpack_content()
+		path(path_)
 	{}
 };
 
@@ -235,7 +229,7 @@ public:
 	virtual bool setString(const std::string &name, const std::string &var);
 private:
 	std::string m_mod_name;
-	bool m_modified;
+	bool m_modified = false;
 };
 
 #endif
diff --git a/src/nameidmapping.h b/src/nameidmapping.h
index 389843061..90aadcf6d 100644
--- a/src/nameidmapping.h
+++ b/src/nameidmapping.h
@@ -56,6 +56,7 @@ public:
 		m_id_to_name.erase(id);
 		m_name_to_id.erase(name);
 	}
+
 	void eraseName(const std::string &name)
 	{
 		u16 id;
diff --git a/src/nodedef.cpp b/src/nodedef.cpp
index db7e36620..1b6c28cf6 100644
--- a/src/nodedef.cpp
+++ b/src/nodedef.cpp
@@ -1923,11 +1923,6 @@ bool CNodeDefManager::nodeboxConnects(MapNode from, MapNode to, u8 connect_face)
 
 NodeResolver::NodeResolver()
 {
-	m_ndef            = NULL;
-	m_nodenames_idx   = 0;
-	m_nnlistsizes_idx = 0;
-	m_resolve_done    = false;
-
 	m_nodenames.reserve(16);
 	m_nnlistsizes.reserve(4);
 }
diff --git a/src/nodedef.h b/src/nodedef.h
index 4669df7f0..97697e746 100644
--- a/src/nodedef.h
+++ b/src/nodedef.h
@@ -207,24 +207,18 @@ enum PlantlikeStyle {
 
 struct TileDef
 {
-	std::string name;
-	bool backface_culling; // Takes effect only in special cases
-	bool tileable_horizontal;
-	bool tileable_vertical;
+	std::string name = "";
+	bool backface_culling = true; // Takes effect only in special cases
+	bool tileable_horizontal = true;
+	bool tileable_vertical = true;
 	//! If true, the tile has its own color.
-	bool has_color;
+	bool has_color = false;
 	//! The color of the tile.
-	video::SColor color;
+	video::SColor color = video::SColor(0xFFFFFFFF);
 
 	struct TileAnimationParams animation;
 
-	TileDef() :
-		name(""),
-		backface_culling(true),
-		tileable_horizontal(true),
-		tileable_vertical(true),
-		has_color(false),
-		color(video::SColor(0xFFFFFFFF))
+	TileDef()
 	{
 		animation.type = TAT_NONE;
 	}
@@ -514,12 +508,12 @@ public:
 
 	void nodeResolveInternal();
 
-	u32 m_nodenames_idx;
-	u32 m_nnlistsizes_idx;
+	u32 m_nodenames_idx = 0;
+	u32 m_nnlistsizes_idx = 0;
 	std::vector<std::string> m_nodenames;
 	std::vector<size_t> m_nnlistsizes;
-	INodeDefManager *m_ndef;
-	bool m_resolve_done;
+	INodeDefManager *m_ndef = nullptr;
+	bool m_resolve_done = false;
 };
 
 #endif
diff --git a/src/nodetimer.h b/src/nodetimer.h
index 0fd43b2a8..e6a8d7608 100644
--- a/src/nodetimer.h
+++ b/src/nodetimer.h
@@ -36,18 +36,18 @@ with this program; if not, write to the Free Software Foundation, Inc.,
 class NodeTimer
 {
 public:
-	NodeTimer(): timeout(0.), elapsed(0.) {}
+	NodeTimer() {}
 	NodeTimer(const v3s16 &position_):
-		timeout(0.), elapsed(0.), position(position_) {}
+		position(position_) {}
 	NodeTimer(f32 timeout_, f32 elapsed_, v3s16 position_):
 		timeout(timeout_), elapsed(elapsed_), position(position_) {}
 	~NodeTimer() {}
-	
+
 	void serialize(std::ostream &os) const;
 	void deSerialize(std::istream &is);
-	
-	f32 timeout;
-	f32 elapsed;
+
+	f32 timeout = 0.0f;
+	f32 elapsed = 0.0f;
 	v3s16 position;
 };
 
@@ -58,12 +58,12 @@ public:
 class NodeTimerList
 {
 public:
-	NodeTimerList(): m_next_trigger_time(-1.), m_time(0.) {}
+	NodeTimerList() {}
 	~NodeTimerList() {}
-	
+
 	void serialize(std::ostream &os, u8 map_format_version) const;
 	void deSerialize(std::istream &is, u8 map_format_version);
-	
+
 	// Get timer
 	NodeTimer get(const v3s16 &p) {
 		std::map<v3s16, std::multimap<double, NodeTimer>::iterator>::iterator n =
@@ -128,8 +128,8 @@ public:
 private:
 	std::multimap<double, NodeTimer> m_timers;
 	std::map<v3s16, std::multimap<double, NodeTimer>::iterator> m_iterators;
-	double m_next_trigger_time;
-	double m_time;
+	double m_next_trigger_time = -1.0;
+	double m_time = 0.0;
 };
 
 #endif
diff --git a/src/noise.cpp b/src/noise.cpp
index b918c9936..e75fb8278 100644
--- a/src/noise.cpp
+++ b/src/noise.cpp
@@ -433,10 +433,6 @@ Noise::Noise(NoiseParams *np_, s32 seed, u32 sx, u32 sy, u32 sz)
 	this->sy   = sy;
 	this->sz   = sz;
 
-	this->persist_buf  = NULL;
-	this->gradient_buf = NULL;
-	this->result       = NULL;
-
 	allocBuffers();
 }
 
diff --git a/src/noise.h b/src/noise.h
index 41b93ae01..d5aca4def 100644
--- a/src/noise.h
+++ b/src/noise.h
@@ -102,26 +102,16 @@ private:
 #define NOISE_FLAG_SIMPLEX     0x10
 
 struct NoiseParams {
-	float offset;
-	float scale;
-	v3f spread;
-	s32 seed;
-	u16 octaves;
-	float persist;
-	float lacunarity;
-	u32 flags;
+	float offset = 0.0f;
+	float scale = 1.0f;
+	v3f spread = v3f(250, 250, 250);
+	s32 seed = 12345;
+	u16 octaves = 3;
+	float persist = 0.6f;
+	float lacunarity = 2.0f;
+	u32 flags = NOISE_FLAG_DEFAULTS;
 
-	NoiseParams()
-	{
-		offset     = 0.0f;
-		scale      = 1.0f;
-		spread     = v3f(250, 250, 250);
-		seed       = 12345;
-		octaves    = 3;
-		persist    = 0.6f;
-		lacunarity = 2.0f;
-		flags      = NOISE_FLAG_DEFAULTS;
-	}
+	NoiseParams() {}
 
 	NoiseParams(float offset_, float scale_, v3f spread_, s32 seed_,
 		u16 octaves_, float persist_, float lacunarity_,
@@ -138,13 +128,6 @@ struct NoiseParams {
 	}
 };
 
-
-// Convenience macros for getting/setting NoiseParams in Settings as a string
-// WARNING:  Deprecated, use Settings::getNoiseParamsFromValue() instead
-#define NOISEPARAMS_FMT_STR "f,f,v3,s32,u16,f"
-//#define getNoiseParams(x, y) getStruct((x), NOISEPARAMS_FMT_STR, &(y), sizeof(y))
-//#define setNoiseParams(x, y) setStruct((x), NOISEPARAMS_FMT_STR, &(y))
-
 class Noise {
 public:
 	NoiseParams np;
@@ -152,10 +135,10 @@ public:
 	u32 sx;
 	u32 sy;
 	u32 sz;
-	float *noise_buf;
-	float *gradient_buf;
-	float *persist_buf;
-	float *result;
+	float *noise_buf = nullptr;
+	float *gradient_buf = nullptr;
+	float *persist_buf = nullptr;
+	float *result = nullptr;
 
 	Noise(NoiseParams *np, s32 seed, u32 sx, u32 sy, u32 sz=1);
 	~Noise();
diff --git a/src/object_properties.cpp b/src/object_properties.cpp
index a77368151..af442806b 100644
--- a/src/object_properties.cpp
+++ b/src/object_properties.cpp
@@ -24,27 +24,7 @@ with this program; if not, write to the Free Software Foundation, Inc.,
 #include "util/basic_macros.h"
 #include <sstream>
 
-ObjectProperties::ObjectProperties():
-	hp_max(1),
-	physical(false),
-	collideWithObjects(true),
-	weight(5),
-	collisionbox(-0.5,-0.5,-0.5, 0.5,0.5,0.5),
-	visual("sprite"),
-	mesh(""),
-	visual_size(1,1),
-	spritediv(1,1),
-	initial_sprite_basepos(0,0),
-	is_visible(true),
-	makes_footstep_sound(false),
-	automatic_rotate(0),
-	stepheight(0),
-	automatic_face_movement_dir(false),
-	automatic_face_movement_dir_offset(0.0),
-	backface_culling(true),
-	nametag(""),
-	nametag_color(255, 255, 255, 255),
-	automatic_face_movement_max_rotation_per_sec(-1)
+ObjectProperties::ObjectProperties()
 {
 	textures.push_back("unknown_object.png");
 	colors.push_back(video::SColor(255,255,255,255));
diff --git a/src/object_properties.h b/src/object_properties.h
index 908757a64..772807fd9 100644
--- a/src/object_properties.h
+++ b/src/object_properties.h
@@ -29,28 +29,28 @@ with this program; if not, write to the Free Software Foundation, Inc.,
 struct ObjectProperties
 {
 	// Values are BS=1
-	s16 hp_max;
-	bool physical;
-	bool collideWithObjects;
-	float weight;
-	aabb3f collisionbox;
-	std::string visual;
-	std::string mesh;
-	v2f visual_size;
+	s16 hp_max = 1;
+	bool physical = false;
+	bool collideWithObjects = true;
+	float weight = 5.0f;
+	aabb3f collisionbox = aabb3f(-0.5f, -0.5f, -0.5f, 0.5f, 0.5f, 0.5f);
+	std::string visual = "sprite";
+	std::string mesh = "";
+	v2f visual_size = v2f(1, 1);
 	std::vector<std::string> textures;
 	std::vector<video::SColor> colors;
-	v2s16 spritediv;
+	v2s16 spritediv = v2s16(1, 1);
 	v2s16 initial_sprite_basepos;
-	bool is_visible;
-	bool makes_footstep_sound;
-	float automatic_rotate;
-	f32 stepheight;
-	bool automatic_face_movement_dir;
-	f32 automatic_face_movement_dir_offset;
-	bool backface_culling;
-	std::string nametag;
-	video::SColor nametag_color;
-	f32 automatic_face_movement_max_rotation_per_sec;
+	bool is_visible = true;
+	bool makes_footstep_sound = false;
+	float automatic_rotate = 0.0f;
+	f32 stepheight = 0.0f;
+	bool automatic_face_movement_dir = false;
+	f32 automatic_face_movement_dir_offset = 0.0f;
+	bool backface_culling = true;
+	std::string nametag = "";
+	video::SColor nametag_color = video::SColor(255, 255, 255, 255);
+	f32 automatic_face_movement_max_rotation_per_sec = -1.0f;
 	std::string infotext;
 	//! For dropped items, this contains item information.
 	std::string wield_item;
diff --git a/src/particles.cpp b/src/particles.cpp
index fe681fe6c..a02c32f21 100644
--- a/src/particles.cpp
+++ b/src/particles.cpp
@@ -76,8 +76,6 @@ Particle::Particle(
 	m_texpos = texpos;
 	m_texsize = texsize;
 	m_animation = anim;
-	m_animation_frame = 0;
-	m_animation_time = 0.0;
 
 	// Color
 	m_base_color = color;
@@ -88,7 +86,6 @@ Particle::Particle(
 	m_velocity = velocity;
 	m_acceleration = acceleration;
 	m_expiration = expirationtime;
-	m_time = 0;
 	m_player = player;
 	m_size = size;
 	m_collisiondetection = collisiondetection;
diff --git a/src/particles.h b/src/particles.h
index 87583aae6..9b10afe4b 100644
--- a/src/particles.h
+++ b/src/particles.h
@@ -86,7 +86,7 @@ private:
 	void updateVertices();
 
 	video::S3DVertex m_vertices[4];
-	float m_time;
+	float m_time = 0.0f;
 	float m_expiration;
 
 	ClientEnvironment *m_env;
@@ -110,8 +110,8 @@ private:
 	bool m_vertical;
 	v3s16 m_camera_offset;
 	struct TileAnimationParams m_animation;
-	float m_animation_time;
-	int m_animation_frame;
+	float m_animation_time = 0.0f;
+	int m_animation_frame = 0;
 	u8 m_glow;
 };
 
diff --git a/src/player.cpp b/src/player.cpp
index 85bc639ec..53e173498 100644
--- a/src/player.cpp
+++ b/src/player.cpp
@@ -30,11 +30,7 @@ with this program; if not, write to the Free Software Foundation, Inc.,
 
 
 Player::Player(const char *name, IItemDefManager *idef):
-	inventory(idef),
-	peer_id(PEER_ID_INEXISTENT),
-	keyPressed(0),
-// protected
-	m_speed(0,0,0)
+	inventory(idef)
 {
 	strlcpy(m_name, name, PLAYERNAME_SIZE);
 
diff --git a/src/player.h b/src/player.h
index 00d27cb90..fc799afb1 100644
--- a/src/player.h
+++ b/src/player.h
@@ -22,6 +22,7 @@ with this program; if not, write to the Free Software Foundation, Inc.,
 
 #include "irrlichttypes_bloated.h"
 #include "inventory.h"
+#include "constants.h"
 #include <list>
 #include <mutex>
 
@@ -32,22 +33,7 @@ with this program; if not, write to the Free Software Foundation, Inc.,
 
 struct PlayerControl
 {
-	PlayerControl()
-	{
-		up = false;
-		down = false;
-		left = false;
-		right = false;
-		jump = false;
-		aux1 = false;
-		sneak = false;
-		LMB = false;
-		RMB = false;
-		pitch = 0;
-		yaw = 0;
-		sidew_move_joystick_axis = .0f;
-		forw_move_joystick_axis = .0f;
-	}
+	PlayerControl() {}
 
 	PlayerControl(
 		bool a_up,
@@ -81,20 +67,20 @@ struct PlayerControl
 		sidew_move_joystick_axis = a_sidew_move_joystick_axis;
 		forw_move_joystick_axis = a_forw_move_joystick_axis;
 	}
-	bool up;
-	bool down;
-	bool left;
-	bool right;
-	bool jump;
-	bool aux1;
-	bool sneak;
-	bool zoom;
-	bool LMB;
-	bool RMB;
-	float pitch;
-	float yaw;
-	float sidew_move_joystick_axis;
-	float forw_move_joystick_axis;
+	bool up = false;
+	bool down = false;
+	bool left = false;
+	bool right = false;
+	bool jump = false;
+	bool aux1 = false;
+	bool sneak = false;
+	bool zoom = false;
+	bool LMB = false;
+	bool RMB = false;
+	float pitch = 0.0f;
+	float yaw = 0.0f;
+	float sidew_move_joystick_axis = 0.0f;
+	float forw_move_joystick_axis = 0.0f;
 };
 
 class Map;
@@ -161,14 +147,14 @@ public:
 	v2s32 local_animations[4];
 	float local_animation_speed;
 
-	u16 peer_id;
+	u16 peer_id = PEER_ID_INEXISTENT;
 
 	std::string inventory_formspec;
 
 	PlayerControl control;
 	const PlayerControl& getPlayerControl() { return control; }
 
-	u32 keyPressed;
+	u32 keyPressed = 0;
 
 	HudElement* getHud(u32 id);
 	u32         addHud(HudElement* hud);
diff --git a/src/profiler.cpp b/src/profiler.cpp
index 8e997442c..738a5b7e3 100644
--- a/src/profiler.cpp
+++ b/src/profiler.cpp
@@ -23,7 +23,7 @@ static Profiler main_profiler;
 Profiler *g_profiler = &main_profiler;
 ScopeProfiler::ScopeProfiler(
 		Profiler *profiler, const std::string &name, ScopeProfilerType type)
-    : m_profiler(profiler), m_name(name), m_timer(NULL), m_type(type)
+    : m_profiler(profiler), m_name(name), m_type(type)
 {
 	if (m_profiler)
 		m_timer = new TimeTaker(m_name);
diff --git a/src/profiler.h b/src/profiler.h
index 2d70e8af4..cade887e8 100644
--- a/src/profiler.h
+++ b/src/profiler.h
@@ -42,9 +42,7 @@ extern Profiler *g_profiler;
 class Profiler
 {
 public:
-	Profiler()
-	{
-	}
+	Profiler() {}
 
 	void add(const std::string &name, float value)
 	{
@@ -195,9 +193,9 @@ public:
 			ScopeProfilerType type = SPT_ADD);
 	~ScopeProfiler();
 private:
-	Profiler *m_profiler;
+	Profiler *m_profiler = nullptr;
 	std::string m_name;
-	TimeTaker *m_timer;
+	TimeTaker *m_timer = nullptr;
 	enum ScopeProfilerType m_type;
 };
 
diff --git a/src/reflowscan.cpp b/src/reflowscan.cpp
index 439b75265..fd169f1a8 100644
--- a/src/reflowscan.cpp
+++ b/src/reflowscan.cpp
@@ -26,8 +26,7 @@ with this program; if not, write to the Free Software Foundation, Inc.,
 
 ReflowScan::ReflowScan(Map *map, INodeDefManager *ndef) :
 	m_map(map),
-	m_ndef(ndef),
-	m_liquid_queue(nullptr)
+	m_ndef(ndef)
 {
 }
 
diff --git a/src/reflowscan.h b/src/reflowscan.h
index a6d289ad5..5b1ef9b5d 100644
--- a/src/reflowscan.h
+++ b/src/reflowscan.h
@@ -39,10 +39,10 @@ private:
 	void scanColumn(int x, int z);
 
 private:
-	Map *m_map;
-	INodeDefManager *m_ndef;
+	Map *m_map = nullptr;
+	INodeDefManager *m_ndef = nullptr;
 	v3s16 m_block_pos, m_rel_block_pos;
-	UniqueQueue<v3s16> *m_liquid_queue;
+	UniqueQueue<v3s16> *m_liquid_queue = nullptr;
 	MapBlock *m_lookup[3 * 3 * 3];
 	u32 m_lookup_state_bitset;
 };
diff --git a/src/remoteplayer.cpp b/src/remoteplayer.cpp
index 540132978..c276062c2 100644
--- a/src/remoteplayer.cpp
+++ b/src/remoteplayer.cpp
@@ -36,15 +36,7 @@ float RemotePlayer::m_setting_chat_message_limit_per_10sec = 0.0f;
 u16 RemotePlayer::m_setting_chat_message_limit_trigger_kick = 0;
 
 RemotePlayer::RemotePlayer(const char *name, IItemDefManager *idef):
-	Player(name, idef),
-	protocol_version(0),
-	m_sao(NULL),
-	m_dirty(false),
-	m_last_chat_message_sent(time(NULL)),
-	m_chat_message_allowance(5.0f),
-	m_message_rate_overhead(0),
-	hud_hotbar_image(""),
-	hud_hotbar_selected_image("")
+	Player(name, idef)
 {
 	if (!RemotePlayer::m_setting_cache_loaded) {
 		RemotePlayer::m_setting_chat_message_limit_per_10sec =
diff --git a/src/remoteplayer.h b/src/remoteplayer.h
index ee0d625b6..965dede50 100644
--- a/src/remoteplayer.h
+++ b/src/remoteplayer.h
@@ -134,7 +134,7 @@ public:
 
 	void setDirty(bool dirty) { m_dirty = true; }
 
-	u16 protocol_version;
+	u16 protocol_version = 0;
 
 private:
 	/*
@@ -145,21 +145,21 @@ private:
 	void serialize(std::ostream &os);
 	void serializeExtraAttributes(std::string &output);
 
-	PlayerSAO *m_sao;
-	bool m_dirty;
+	PlayerSAO *m_sao = nullptr;
+	bool m_dirty = false;
 
 	static bool m_setting_cache_loaded;
 	static float m_setting_chat_message_limit_per_10sec;
 	static u16 m_setting_chat_message_limit_trigger_kick;
 
-	u32 m_last_chat_message_sent;
-	float m_chat_message_allowance;
-	u16 m_message_rate_overhead;
+	u32 m_last_chat_message_sent = std::time(0);
+	float m_chat_message_allowance = 5.0f;
+	u16 m_message_rate_overhead = 0;
 
 	bool m_day_night_ratio_do_override;
 	float m_day_night_ratio;
-	std::string hud_hotbar_image;
-	std::string hud_hotbar_selected_image;
+	std::string hud_hotbar_image = "";
+	std::string hud_hotbar_selected_image = "";
 
 	std::string m_sky_type;
 	video::SColor m_sky_bgcolor;
diff --git a/src/rollback.cpp b/src/rollback.cpp
index 4d34decf3..a77a9ee15 100644
--- a/src/rollback.cpp
+++ b/src/rollback.cpp
@@ -91,8 +91,7 @@ struct Entity {
 
 RollbackManager::RollbackManager(const std::string & world_path,
 		IGameDef * gamedef_) :
-	gamedef(gamedef_),
-	current_actor_is_guess(false)
+	gamedef(gamedef_)
 {
 	verbosestream << "RollbackManager::RollbackManager(" << world_path
 		<< ")" << std::endl;
diff --git a/src/rollback.h b/src/rollback.h
index a05ef8b78..e0b3c7c55 100644
--- a/src/rollback.h
+++ b/src/rollback.h
@@ -80,10 +80,10 @@ private:
 		time_t suspect_t, v3s16 action_p, time_t action_t);
 
 
-	IGameDef * gamedef;
+	IGameDef *gamedef = nullptr;
 
 	std::string current_actor;
-	bool current_actor_is_guess;
+	bool current_actor_is_guess = false;
 
 	std::list<RollbackAction> action_todisk_buffer;
 	std::list<RollbackAction> action_latest_buffer;
diff --git a/src/rollback_interface.h b/src/rollback_interface.h
index 92fab9b9c..a5f0c34fc 100644
--- a/src/rollback_interface.h
+++ b/src/rollback_interface.h
@@ -35,8 +35,8 @@ class InventoryManager;
 struct RollbackNode
 {
 	std::string name;
-	int param1;
-	int param2;
+	int param1 = 0;
+	int param2 = 0;
 	std::string meta;
 
 	bool operator == (const RollbackNode &other)
@@ -46,11 +46,7 @@ struct RollbackNode
 	}
 	bool operator != (const RollbackNode &other) { return !(*this == other); }
 
-	RollbackNode():
-		param1(0),
-		param2(0)
-	{}
-
+	RollbackNode() {}
 	RollbackNode(Map *map, v3s16 p, IGameDef *gamedef);
 };
 
@@ -70,7 +66,7 @@ struct RollbackAction
 	v3s16 p;
 	RollbackNode n_old;
 	RollbackNode n_new;
-	
+
 	std::string inventory_location;
 	std::string inventory_list;
 	u32 inventory_index;
@@ -103,13 +99,13 @@ struct RollbackAction
 		inventory_add = add_;
 		inventory_stack = inventory_stack_;
 	}
-	
+
 	// String should not contain newlines or nulls
 	std::string toString() const;
-	
+
 	// Eg. flowing water level changes are not important
 	bool isImportant(IGameDef *gamedef) const;
-	
+
 	bool getPosition(v3s16 *dst) const;
 
 	bool applyRevert(Map *map, InventoryManager *imgr, IGameDef *gamedef) const;
diff --git a/src/server.cpp b/src/server.cpp
index b4b6882e5..95d2371ff 100644
--- a/src/server.cpp
+++ b/src/server.cpp
@@ -156,41 +156,19 @@ Server::Server(
 	m_simple_singleplayer_mode(simple_singleplayer_mode),
 	m_dedicated(dedicated),
 	m_async_fatal_error(""),
-	m_env(NULL),
 	m_con(PROTOCOL_ID,
 			512,
 			CONNECTION_TIMEOUT,
 			ipv6,
 			this),
-	m_banmanager(NULL),
-	m_rollback(NULL),
-	m_enable_rollback_recording(false),
-	m_emerge(NULL),
-	m_script(NULL),
 	m_itemdef(createItemDefManager()),
 	m_nodedef(createNodeDefManager()),
 	m_craftdef(createCraftDefManager()),
 	m_event(new EventManager()),
-	m_thread(NULL),
-	m_time_of_day_send_timer(0),
 	m_uptime(0),
 	m_clients(&m_con),
-	m_shutdown_requested(false),
-	m_shutdown_ask_reconnect(false),
-	m_shutdown_timer(0.0f),
-	m_admin_chat(iface),
-	m_ignore_map_edit_events(false),
-	m_ignore_map_edit_events_peer_id(0),
-	m_next_sound_id(0),
-	m_mod_storage_save_timer(10.0f)
+	m_admin_chat(iface)
 {
-	m_liquid_transform_timer = 0.0;
-	m_liquid_transform_every = 1.0;
-	m_masterserver_timer = 0.0;
-	m_emergethread_trigger_timer = 0.0;
-	m_savemap_timer = 0.0;
-
-	m_step_dtime = 0.0;
 	m_lag = g_settings->getFloat("dedicated_server_step");
 
 	if(path_world == "")
diff --git a/src/server.h b/src/server.h
index 3086e8762..b60482a75 100644
--- a/src/server.h
+++ b/src/server.h
@@ -113,8 +113,8 @@ struct ServerSoundParams
 	float fade = 0.0f;
 	float pitch = 1.0f;
 	bool loop = false;
-	float max_hear_distance = 32*BS;
-	v3f pos = v3f(0, 0, 0);
+	float max_hear_distance = 32 * BS;
+	v3f pos;
 	u16 object = 0;
 	std::string to_player = "";
 
@@ -142,7 +142,7 @@ public:
 		bool simple_singleplayer_mode,
 		bool ipv6,
 		bool dedicated,
-		ChatInterface *iface = NULL
+		ChatInterface *iface = nullptr
 	);
 	~Server();
 	DISABLE_CLASS_COPY(Server);
@@ -521,32 +521,32 @@ private:
 	MutexedVariable<std::string> m_async_fatal_error;
 
 	// Some timers
-	float m_liquid_transform_timer;
-	float m_liquid_transform_every;
-	float m_masterserver_timer;
-	float m_emergethread_trigger_timer;
-	float m_savemap_timer;
+	float m_liquid_transform_timer = 0.0f;
+	float m_liquid_transform_every = 1.0f;
+	float m_masterserver_timer = 0.0f;
+	float m_emergethread_trigger_timer = 0.0f;
+	float m_savemap_timer = 0.0f;
 	IntervalLimiter m_map_timer_and_unload_interval;
 
 	// Environment
-	ServerEnvironment *m_env;
+	ServerEnvironment *m_env = nullptr;
 
 	// server connection
 	con::Connection m_con;
 
 	// Ban checking
-	BanManager *m_banmanager;
+	BanManager *m_banmanager = nullptr;
 
 	// Rollback manager (behind m_env_mutex)
-	IRollbackManager *m_rollback;
-	bool m_enable_rollback_recording; // Updated once in a while
+	IRollbackManager *m_rollback = nullptr;
+	bool m_enable_rollback_recording = false; // Updated once in a while
 
 	// Emerge manager
-	EmergeManager *m_emerge;
+	EmergeManager *m_emerge = nullptr;
 
 	// Scripting
 	// Envlock and conlock should be locked when using Lua
-	ServerScripting *m_script;
+	ServerScripting *m_script = nullptr;
 
 	// Item definition manager
 	IWritableItemDefManager *m_itemdef;
@@ -569,21 +569,21 @@ private:
 
 	// A buffer for time steps
 	// step() increments and AsyncRunStep() run by m_thread reads it.
-	float m_step_dtime;
+	float m_step_dtime = 0.0f;
 	std::mutex m_step_dtime_mutex;
 
 	// current server step lag counter
 	float m_lag;
 
 	// The server mainly operates in this thread
-	ServerThread *m_thread;
+	ServerThread *m_thread = nullptr;
 
 	/*
 		Time related stuff
 	*/
 
 	// Timer for sending time of day over network
-	float m_time_of_day_send_timer;
+	float m_time_of_day_send_timer = 0.0f;
 	// Uptime of server in seconds
 	MutexedVariable<double> m_uptime;
 	/*
@@ -602,10 +602,10 @@ private:
 		Random stuff
 	*/
 
-	bool m_shutdown_requested;
+	bool m_shutdown_requested = false;
 	std::string m_shutdown_msg;
-	bool m_shutdown_ask_reconnect;
-	float m_shutdown_timer;
+	bool m_shutdown_ask_reconnect = false;
+	float m_shutdown_timer = 0.0f;
 
 	ChatInterface *m_admin_chat;
 	std::string m_admin_nick;
@@ -629,7 +629,7 @@ private:
 		all sending of information by itself.
 		This is behind m_env_mutex
 	*/
-	bool m_ignore_map_edit_events;
+	bool m_ignore_map_edit_events = false;
 	/*
 		If a non-empty area, map edit events contained within are left
 		unsent. Done at map generation time to speed up editing of the
@@ -642,7 +642,7 @@ private:
 		this peed id as the disabled recipient
 		This is behind m_env_mutex
 	*/
-	u16 m_ignore_map_edit_events_peer_id;
+	u16 m_ignore_map_edit_events_peer_id = 0;
 
 	// media files known to server
 	std::unordered_map<std::string, MediaInfo> m_media;
@@ -651,7 +651,7 @@ private:
 		Sounds
 	*/
 	std::unordered_map<s32, ServerPlayingSound> m_playing_sounds;
-	s32 m_next_sound_id;
+	s32 m_next_sound_id = 0;
 
 	/*
 		Detached inventories (behind m_env_mutex)
@@ -662,7 +662,7 @@ private:
 	std::map<std::string, std::string> m_detached_inventories_player;
 
 	std::unordered_map<std::string, ModMetadata *> m_mod_storages;
-	float m_mod_storage_save_timer;
+	float m_mod_storage_save_timer = 10.0f;
 };
 
 /*
diff --git a/src/serverenvironment.cpp b/src/serverenvironment.cpp
index 161b24fd4..e8bdd2a28 100644
--- a/src/serverenvironment.cpp
+++ b/src/serverenvironment.cpp
@@ -54,8 +54,7 @@ with this program; if not, write to the Free Software Foundation, Inc.,
 */
 
 ABMWithState::ABMWithState(ActiveBlockModifier *abm_):
-	abm(abm_),
-	timer(0)
+	abm(abm_)
 {
 	// Initialize timer to random value to spread processing
 	float itv = abm->getTriggerInterval();
@@ -365,15 +364,7 @@ ServerEnvironment::ServerEnvironment(ServerMap *map,
 	m_map(map),
 	m_script(scriptIface),
 	m_server(server),
-	m_path_world(path_world),
-	m_send_recommended_timer(0),
-	m_active_block_interval_overload_skip(0),
-	m_game_time(0),
-	m_game_time_fraction_counter(0),
-	m_last_clear_objects_time(0),
-	m_recommended_send_interval(0.1),
-	m_max_lag_estimate(0.1),
-	m_player_database(NULL)
+	m_path_world(path_world)
 {
 	// Determine which database backend to use
 	std::string conf_path = path_world + DIR_DELIM + "world.mt";
diff --git a/src/serverenvironment.h b/src/serverenvironment.h
index 3b7bf8fb0..375b28f8a 100644
--- a/src/serverenvironment.h
+++ b/src/serverenvironment.h
@@ -70,7 +70,7 @@ public:
 struct ABMWithState
 {
 	ActiveBlockModifier *abm;
-	float timer;
+	float timer = 0.0f;
 
 	ABMWithState(ActiveBlockModifier *abm_);
 };
@@ -80,7 +80,7 @@ struct LoadingBlockModifierDef
 	// Set of contents to trigger on
 	std::set<std::string> trigger_contents;
 	std::string name;
-	bool run_at_every_load;
+	bool run_at_every_load = false;
 
 	virtual ~LoadingBlockModifierDef() {}
 	virtual void trigger(ServerEnvironment *env, v3s16 p, MapNode n){};
@@ -104,10 +104,7 @@ struct LBMContentMapping
 class LBMManager
 {
 public:
-	LBMManager():
-		m_query_mode(false)
-	{}
-
+	LBMManager() {}
 	~LBMManager();
 
 	// Don't call this after loadIntroductionTimes() ran.
@@ -128,7 +125,7 @@ public:
 private:
 	// Once we set this to true, we can only query,
 	// not modify
-	bool m_query_mode;
+	bool m_query_mode = false;
 
 	// For m_query_mode == false:
 	// The key of the map is the LBM def's name.
@@ -399,35 +396,35 @@ private:
 	// Outgoing network message buffer for active objects
 	std::queue<ActiveObjectMessage> m_active_object_messages;
 	// Some timers
-	float m_send_recommended_timer;
+	float m_send_recommended_timer = 0.0f;
 	IntervalLimiter m_object_management_interval;
 	// List of active blocks
 	ActiveBlockList m_active_blocks;
 	IntervalLimiter m_active_blocks_management_interval;
 	IntervalLimiter m_active_block_modifier_interval;
 	IntervalLimiter m_active_blocks_nodemetadata_interval;
-	int m_active_block_interval_overload_skip;
+	int m_active_block_interval_overload_skip = 0;
 	// Time from the beginning of the game in seconds.
 	// Incremented in step().
-	u32 m_game_time;
+	u32 m_game_time = 0;
 	// A helper variable for incrementing the latter
-	float m_game_time_fraction_counter;
+	float m_game_time_fraction_counter = 0.0f;
 	// Time of last clearObjects call (game time).
 	// When a mapblock older than this is loaded, its objects are cleared.
-	u32 m_last_clear_objects_time;
+	u32 m_last_clear_objects_time = 0;
 	// Active block modifiers
 	std::vector<ABMWithState> m_abms;
 	LBMManager m_lbm_mgr;
 	// An interval for generally sending object positions and stuff
-	float m_recommended_send_interval;
+	float m_recommended_send_interval = 0.1f;
 	// Estimate for general maximum lag as determined by server.
 	// Can raise to high values like 15s with eg. map generation mods.
-	float m_max_lag_estimate;
+	float m_max_lag_estimate = 0.1f;
 
 	// peer_ids in here should be unique, except that there may be many 0s
 	std::vector<RemotePlayer*> m_players;
 
-	PlayerDatabase *m_player_database;
+	PlayerDatabase *m_player_database = nullptr;
 
 	// Particles
 	IntervalLimiter m_particle_management_interval;